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I just re-calibrated. TPU is now successfully feeding all the way to the extruder (2).
Thanks a lot for that hint!
Additionally I had to tighten the feeder (move the indicator 1-2mm below middle point), so TPU would properly feed and unload again.
FG
p.s. somehow re-calibration decoupler (2) failed 5 times in a row. then I succeeded with re-calibrating decoupler (1) immediately. thereafter, my first attempt to re-calibrate decoupler (2) worked immediately. seems there is a requirement of calibrating decoupler (1) first.
flyinggorilla's post in Material Station aborts feeding TPU on Extruder 2 - Ultimaker S5 was marked as the answer